Who here knows about 1970 Camaros?
 

A friend asked me if all 1970 Camaros (I assume he means 1970.5) had 12-bolts. Anyone know?

I'd guess that smaller engines didn't get 12-bolts, but I also know Chevy was much more consistent with rear end specs than BOP so I dunno.

70 Camaro SS 350 (L-48/4bbl) got the 12 Bolt
70 Camaro SS 396 (L34 & L78) got the 12 Bolt

Is this the info you asked for ????

So what about non-SS cars like 6, 307, 350?

All three got 10 Bolt rears*. The 350 SS, the two 396 SS and Z28 got 12 Bolt rears:

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As you can see from the chart above the 8.125" Gear = 10 Bolt while the 8.875" Gear = 12 Bolt

Only the Z28 and the L78 396 offered optional hi performance rear end gears from the factory. You will notice that the L78 is missing from the above data. It came standard with a 3.55 12 Bolt Posi (mandatory option) rear with 4.10 gears optional which had Posi mandatory. RPO ZQ9 was the optional 4.10 gears for the Z28 and the L78

1970 would be the last year for the 12 Bolt rear in a Camaro. Beginning in 1971 all Camaros got the new 8.5" geared 10 Bolt Corporate rear.

*Now . . . . with all that said I believe there was a way for you to get a 12 Bolt rear in a 350-2V Camaro which was the only Camaro to offer a "performance" rear. The ratio was 3.31 and it was only available with the TH Auto Trans instead of the standard 2.73. This may . . . . I repeat . . . may be RPO YD1: Special Trailer Towing Axle. Only 132 were sold by Chevy.

Thank you!

You're Welcome

Here are the axle codes for the above. One does puzzle me. It says that if you order ZQ9 you also have to order G80: Positraction. But there is no code for that. Only a code for an "open" 4.10 which supposedly you couldn't order.

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Lee Stewart.......What is your expertise and evidence that a 70 Camaro L-78/M-40 was built ????
Thanks for the education !!!!!!!!

Chuck Sharin
70' Camaro wanna be

I just want to add the 1970 pontiac firebird trans am and formula received 12 bolts also.

I believe it was Chevrolet's intent to offer the M40 TH400 in the 1970 L78 Camaro SS 396. They even set aside an engine code: CTY. But from what I understand none were built. All 600 have a 4 speed. It's one of those cars that many say exist, they even say they saw one but no one has yet been able to provide bulletproof documentation. An urban legend.

If you look at the original 1970 Camaro brochure (before it was revised) and some early magazine ads you will see that an option for the SS was to be the LS6 454. Some say Chevy made a few before the option was cancelled - pure BS. The option was cancelled before the car was put into production. There are no engine codes for a 1970 Camaro SS with an LS6 454.

Another urban legend was the 1970 LS7 454 Corvette. The brochure was never revised and there was a magazine ad - the option was cancelled before production began

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Other "urban legends" based on what the brochure or magazine ad said was available when it really wasn't are:

1967 427 Fairlane GT
1968 427 Torino/Fairlane
1968 427 Mustang GT
1970 Boss 429 Cyclone
1970 Boss 429 Cougar Eliminator
1970 Boss 429 Torino Cobra